kfzwmn and raising boost

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BoobieTrap

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	kfzwmn and raising boost « on: March 13, 2017, 11:47:43 AM »

Am I right assuming that that I can keep raising boost while retarding spark angle map KFZW/KFZW2 as long as CF corrections stay low AND the total corrected angle is above KFZWMN?
Or does the retard of the spark angle negate the gain from boost increase once the spark angle starts to get really low?

I'm running forged rods and ID1000cc injectors, egts are currently below 850C on WOT @22psi on a hybrid turbo so I'm wondering if I should push it further.


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nyet

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	Re: kfzwmn and raising boost « Reply #1 on: March 13, 2017, 11:49:17 AM »

Quote from: BoobieTrap on March 13, 2017, 11:47:43 AM

Am I right assuming that that I can keep raising boost while retarding spark angle map KFZW/KFZW2 as long as CF corrections stay low AND the total corrected angle is above KFZWMN?

Low or zero, and KFZWMN doesn't really matter.

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Or does the retard of the spark angle negate the gain from boost increase once the spark angle starts to get really low?

At some point, you are just leaving power on the table by raising boost.


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vwaudiguy

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	Re: kfzwmn and raising boost « Reply #2 on: March 13, 2017, 11:59:11 AM »

Quote from: BoobieTrap on March 13, 2017, 11:47:43 AM

egts are currently below 850C on WOT @22psi on a hybrid turbo so I'm wondering if I should push it further.

Calculated or measured? Stock MAF?


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BoobieTrap

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	Re: kfzwmn and raising boost « Reply #3 on: March 13, 2017, 12:07:10 PM »

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At some point, you are just leaving power on the table by raising boost.

So at which point should I stop raising boost if everything else is in check? Is there a threshold timing angle above 3k RPM that should not be retarded further?

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Calculated or measured? Stock MAF?

Measured on a dash gauge with the probe in the exhaust manifold pre-turbo.
Stock MAF, although I have an RS4 MAF ready to go in. Current MAF is up to 4.7V so is near saturation.
I have a dash AFR gauge too, so I keep an eye on it. Currently running 11.8 at WOT.


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nyet

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	Re: kfzwmn and raising boost « Reply #4 on: March 13, 2017, 12:20:27 PM »

Quote from: BoobieTrap on March 13, 2017, 12:07:10 PM

So at which point should I stop raising boost if everything else is in check? Is there a threshold timing angle above 3k RPM that should not be retarded further?

Compressor map will give you a ballpark idea where the turbo runs out of breath, but only a dyno will tell you for sure.


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